Softwr

Cloud · head to head

Caddy vs NATS

Caddy logo

Caddy

Cloud

Web server with automatic HTTPS by default

From
Free
Rated
-
Full reviewWebsite
NATS logo

NATS

Databases

High-performance messaging system for cloud-native applications

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Caddy smaller ecosystem than Nginx, so third-party guides and modules are fewer; NATS core NATS has no persistence at all, so messages are lost if no subscriber is listening
  • They diverge on capability: Caddy covers Automatic HTTPS, NATS covers Very low latency.
  • Prices and features above were last checked on 29 August 2026.

Where they differ

Only the attributes on which Caddy and NATS actually diverge.

Attributes where Caddy and NATS differ
AttributeCaddyNATS
PlatformsLinux, macOS, Windows, DockerLinux, macOS, Windows, Docker, Kubernetes
CategoryCloudDatabases

Identical on both: starting price (Free), pricing model (Open source, no licence fee), free tier (Yes), user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Caddy

  • Automatic HTTPS
  • Caddyfile
  • Reverse proxy

Only in NATS

  • Very low latency
  • JetStream
  • Request-reply

Both cover

  • Single binary

What people use each for

The jobs each tool is most often brought in to do.

Caddy

  • Sites and services where expired certificates have caused outages beforenot NATS
  • Small deployments where Nginx configuration is more effort than the problem warrantsnot NATS
  • Reverse proxying internal services with TLS without a certificate workflownot NATS

NATS

  • Service-to-service messaging where latency is the binding constraintnot Caddy
  • Edge and IoT messaging where a lightweight broker mattersnot Caddy
  • Replacing a heavier broker when the workload does not need its guaranteesnot Caddy

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Caddy

  • Smaller ecosystem than Nginx, so third-party guides and modules are fewer
  • Adding plugins means rebuilding the binary rather than loading a module
  • Under very high throughput Nginx generally still benchmarks ahead
  • Automatic certificate issuance needs outbound internet access, which complicates air-gapped deployments

NATS

  • Core NATS has no persistence at all, so messages are lost if no subscriber is listening
  • JetStream adds the durability but also the operational complexity NATS is chosen to avoid
  • A much smaller ecosystem than Kafka or RabbitMQ, with fewer connectors and integrations
  • Fewer people know it, so hiring and existing organisational knowledge favour the alternatives

Pricing, plan by plan

Caddy

Free
  • CaddyFree
    • Full functionality
    • Commercial use permitted
    • Community support

NATS

Free
  • NATSFree
    • Full functionality
    • No usage limits
    • Community support

Which should you pick?

Choose Caddy if

  • You need automatic https.
  • You want to start without paying.
  • You work on Linux, macOS, Windows, Docker.
  • You also want caddyfile.
Caddy review

Choose NATS if

  • You need very low latency.
  • You want to start without paying.
  • You work on Linux, macOS, Windows, Docker, Kubernetes.
  • You also want jetstream.
NATS review

Questions people ask

Is Caddy or NATS better?
Neither clearly leads. Caddy starts at Free and NATS at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Caddy or NATS?
Caddy starts at Free and NATS at Free.
Does Caddy or NATS run on more platforms?
Caddy runs on Linux, macOS, Windows, Docker. NATS runs on Linux, macOS, Windows, Docker, Kubernetes.
Can I use Caddy for free?
Both have a free tier, so you can try either at no cost before committing.
What is Caddy best used for?
Caddy is most often used for sites and services where expired certificates have caused outages before, small deployments where nginx configuration is more effort than the problem warrants, reverse proxying internal services with tls without a certificate workflow. Of those, sites and services where expired certificates have caused outages before and small deployments where nginx configuration is more effort than the problem warrants are not what NATS is typically brought in for.
What can Caddy do that NATS cannot?
Caddy covers Automatic HTTPS, Caddyfile, Reverse proxy. NATS covers Very low latency, JetStream, Request-reply. Both handle Single binary.

Answered from the vendors’ own pages

Caddy: Is Caddy free?

Yes, open source under the Apache 2.0 licence, free for commercial use.

NATS: Is NATS free?

Yes, open source and CNCF-graduated. Synadia sells a managed service.

Caddy: What does automatic HTTPS mean?

Caddy obtains certificates from Let’s Encrypt or ZeroSSL on first request and renews them before expiry, with no cron job or configuration.

NATS: Does NATS persist messages?

Core NATS does not — it is fire-and-forget. JetStream adds persistence, streaming and replay when you need them.

Caddy: Caddy or Nginx?

Caddy is dramatically simpler to configure and removes certificate management. Nginx has the larger ecosystem and better peak throughput.

NATS: NATS or Kafka?

NATS is far lighter and lower latency, and much simpler to run. Kafka is the answer when you need a durable replayable log and a large connector ecosystem.

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